Prevention and treatment of bacterial perforation in peach

(1) harmful symptoms.

Peach bacterial perforation mainly harms peach leaves, but also infects shoots and fruits. After the injury of the leaves, there are nearly round or irregular brown disease spots, which gradually dry up and fall off to form perforation, so it is called perforation disease. In severe cases, several disease spots are often connected to form scorched and strong spots, which dry up most of the leaves and cause early defoliation, so the disease is also called early defoliation disease of peach trees.

(2) Prevention and control methods.

① strengthens the comprehensive management of Taoyuan. Increase the application of organic fertilizer, avoid partial application of nitrogen fertilizer, pay attention to orchard drainage, reasonable pruning, make peach orchard ventilated and transparent, promote tree growth and improve disease resistance. ② thoroughly remove withered branches, fallen leaves, fallen fruit, concentrated burning or deep burial, to eliminate the source of primary infection bacteria; ③ chemical control. Spray the peach tree with 4: 5 Baume stone sulfur mixture or 70% Solibar 50: 80 times before sprouting, or spray 1-1-100 Bordeaux solution. During the growing period, spray 65% Dysen zinc wettable powder 500 times, or 10% germicidal water 800 times, or 70% Solibar 150 times 200 times or zinc sulfate lime solution (1 part of zinc sulfate, 4 parts of hydrated lime, 240 parts of water and fully mixed) and so on.